Chronic dehydration affecting workplace performance, research suggests

Chronic dehydration may be contributing to reduced workplace performance across the UK, with symptoms such as fatigue, poor concentration and “brain fog” becoming increasingly common, according to research from air up.

Findings from the UK National Hydration & Wellness Survey 2025 found that 58% of UK adults are chronically dehydrated, raising concerns about the impact on both health and productivity.

Among those affected, 78% reported experiencing unexplained fatigue or sluggishness on a weekly basis, while 71% said they struggle with concentration and 62% reported frequent headaches.

The report suggested these symptoms are often misinterpreted as stress, poor sleep or demanding routines, rather than signs of dehydration.

Guidance from the National Health Service links dehydration to symptoms including tiredness, dizziness, headaches and confusion, all of which can affect workplace performance.

Additional research cited in the findings, including evidence from the British Journal of Nutrition, indicated that even mild dehydration can impair cognitive function, including reduced vigilance, slower working memory and increased fatigue.

The research also highlighted misconceptions around hydration habits.

Around 45% of UK adults believe drinks such as tea, coffee and energy drinks count towards proper hydration, while 28% said they rely on caffeine to maintain productivity, rising to 41% among those aged 25 to 34.